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Author (up) Allen, R.; Thanassoulis, E. doi  openurl
  Title Improving envelopment in data envelopment analysis Type
  Year 2004 Publication European Journal of Operational Research Abbreviated Journal  
  Volume 154 Issue 2 Pages 363-379  
  Keywords Data Envelopment Analysis (DEA ); Productivity analysis; Linear programming applications; Performance management; Value judgments  
  Abstract Data envelopment analysis defines the relative efficiency of a decision making unit (DMU) as the ratio of the sum of its weighted outputs to the sum of its weighted inputs allowing the DMUs to freely allocate weights to their inputs/outputs. However, this measure may not reflect a DMU’s true efficiency as some inputs/outputs may not contribute reasonably to the efficiency measure. Traditionally, to overcome this problem weights restrictions have been imposed. This paper offers a new approach to this problem where DMUs operate a constant returns to scale technology in a single input multi-output context. The approach is based on introducing unobserved DMUs, created by adjusting the output levels of certain observed relatively efficient DMUs, reflecting a combination of technical information of feasible production levels and the DM’s value judgments. Its main advantage is that the information conveyed by the DM is local, with reference to a specific observed DMU. The approach is illustrated on a real life application.  
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  Call Number Admin @ admin @ AllenThanassoulis2004 Serial 2505  
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